A novel method for generating structured illumination of three-dimensional shape measurement using phase modulation

Xianlin Song; Jianshuang Wei; Lingfang Song

doi:10.1117/12.2581302

27 March 2021 A novel method for generating structured illumination of three-dimensional shape measurement using phase modulation

Xianlin Song, Jianshuang Wei, Lingfang Song

Author Affiliations +

Proceedings Volume 11765, Optical Architectures for Displays and Sensing in Augmented, Virtual, and Mixed Reality (AR, VR, MR) II; 117650X (2021) https://doi.org/10.1117/12.2581302
Event: SPIE AR VR MR, 2021, Online Only

Abstract

With the development of science and technology and industrial production, the application of three-dimensional shape measurement technology in the fields of machine vision, industrial monitoring, mechanical engineering and medical testing has become increasingly widespread. The optical three-dimensional shape measurement technology is a method that uses a series of optical methods to obtain the three-dimensional information of the measured object, and the structured light measurement method is a widely used measurement method. In the structured light measurement method, the generation of fringe patterns is a very important link. Here, we use holographic method to generate a fringe pattern whose period and phase can be easily modulated. First, a black and white fringe pattern with a certain spatial frequency is generated according to the cosine structured light period and phase. The spatial frequency of the black and white fringe is determined by the spatial frequency of the structured light to be generated and the magnification of the projection system. A prism phase that can cause lateral movement is applied to the black part of the black and white stripes, so that the light incident on the black area deviates from the optical axis to the first order of diffraction, while the light incident on other parts (without being modulated) continues to travel along the optical axis. In this way, the deviated beam is bright and dark, and finally structured illumination is obtained. Theories and experiments verify the effectiveness of the method. The method to generate fringe patterns is simple, fast, accurate and can be conveniently controlled, and can be well applied to three-dimensional shape measurement technology.

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Xianlin Song, Jianshuang Wei, and Lingfang Song "A novel method for generating structured illumination of three-dimensional shape measurement using phase modulation", Proc. SPIE 11765, Optical Architectures for Displays and Sensing in Augmented, Virtual, and Mixed Reality (AR, VR, MR) II, 117650X (27 March 2021); https://doi.org/10.1117/12.2581302

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KEYWORDS

Fringe analysis

Phase measurement

Phase modulation

Structured light

Optical testing

Spatial frequencies

Modulation

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